Blocked polyisocyanate-containing curable silicone composition and textile treatment using the same

Abstract

A blocked polyisocyanate-containing curable silicone composition includes an amino group-containing organopolysiloxane, a blocked polyisocyanate and a catalyst which is an organic base compound and/or a metal compound. The composition has a high curability even under low-temperature conditions and, when used as a textile treatment, imparts textile fibers and products with good softness and water absorbency, and also has an excellent durability to washing.

The invention claimed is: 
     
       1. A blocked polyisocyanate-containing curable silicone composition comprising:
 (A) 70 to 98 parts by weight of an organopolysiloxane having a terminal or pendant group of general formula (1) below 
 
       
         
           
           
               
               
           
         
       
       wherein R 5  is a divalent hydrocarbon group of 1 to 8 carbon atoms, the letter “a” is an integer from 0 to 4, and each R 6  is independently a hydrogen atom, a monovalent hydrocarbon group or acyl group of 1 to 10 carbon atoms, or a polyoxyalkylene-containing organic group of the formula
   —CH 2 —CH(OH)CH 2 O—(C 2 H 4 O) b —(C 3 H 6 O) c —Z,
 
 wherein Z is a hydrogen atom, a substituted or unsubstituted monovalent hydrocarbon group or acyl group of 1 to 20 carbon atoms, b is an integer from 2 to 30, c is an integer from 0 to 20, and the oxyethylene units and oxypropylene units may form a block polymer or may form a random polymer; 
 (B) 2 to 30 parts by weight of a blocked polyisocyanate which has at least two isocyanate groups per molecule, at least 50 mol % of the isocyanate groups being blocked with a thermally labile blocking agent, with the proviso that the combined amount of components (A) and (B) is 100 parts by weight; and 
 (C) 0.01 to 10 parts by weight of a catalyst which is an organic base compound or a metal compound or both; 
 wherein component (A) is at least one of the organopolysiloxanes of the following formulas 
 
       
         
           
           
               
               
           
         
       
       wherein n is an integer from 10 to 2,000; m is an integer from 1 to 10; and b, c and Z are as defined above. 
     
     
       2. The silicone composition of  claim 1 , wherein component (B) is a blocked polyisocyanate that includes a polyisocyanate compound consisting of aliphatic and/or alicyclic diisocyanate monomers. 
     
     
       3. The silicone composition of  claim 2 , wherein the polyisocyanate compound has an isocyanurate structure. 
     
     
       4. The silicone composition of  claim 1 , wherein the thermally labile blocking agent serving as component (B) is at least one compound selected from the group consisting of oxime compounds, pyrazole compounds and active ethylene compounds. 
     
     
       5. The silicone composition of  claim 1 , wherein the organopolysiloxane serving as component (A) includes groups selected from among hydroxyl, alkoxy, acyloxy and amino groups, at least one of the groups being in a reacted state with an isocyanate group on component (B). 
     
     
       6. The silicone composition of  claim 1 , wherein the catalyst serving as component (C) is a compound containing at least one metal selected from the group consisting of zinc, titanium, iron, tin, lead, copper, bismuth, aluminum and zirconium. 
     
     
       7. A silicone emulsion composition containing the silicone composition of  claim 1 . 
     
     
       8. A textile treatment containing the composition of  claim 1 .